The feedback from the ABB positioner shows fluctuations of around 0.2
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There is an ABB valve positioner on site, and the valve is from Arka; it is used to regulate the oxygen flow rate entering the furnace. The regulation is done manually, and there are frequent fluctuations in the feedback value of around 0.2%, which also results in changes in the oxygen flow rate. These fluctuations in feedback are irregular, and no leaks were detected at the site. Have any of you encountered this situation? What are the reasons for this situation?
The urea plant I work at uses Parker actuators, and there are fluctuations in the manual operation of the valves. Upon disassembly for inspection, it was found that the sealing components, push rods, cylinder barrels, and pistons were worn out; air leakage inside the cylinder was causing the valve fluctuations.
Can 0.2 be considered a fluctuation? . . . .
Oxygen content has a significant impact on the operating temperature of the gasifier
You’d better go and check in person to see if there are any fluctuations
I don’t understand what you mean. Does the dead zone mean 0.2?
Do fluctuations occur at any position?
0.2 is basically not noticeable; the valve’s stroke is already very small, so it has no impact
There’s nothing that can be done about it; some positioners come out of the factory in this condition, and the only option is to replace them. This one can be used in places where high requirements aren’t imposed.